Quick-adjusting micrometer.



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lfatentd Sept 1.5,

H. o. Cosmmo.` QUICK DJUSTING MICBOKETH..

PPLITIN FILED X. 9. 1908..

the herein described caliper is an enibodi- HENRY OWEN COSTELLO, OF PROVIDENCE, YRHODE ISLAND.

QUICK-ADJUSTING MICROMETER. Y e

specification of Letters Patent.

Application tiled January 9,

l i i vented certain new and useful Improve-' ments in Quick-Adjusting Microineteis; and 1 do dee-lare the following to be a full, clear, and exactdescription "of the invention, such as will enable others skilled in the art to which it appcrtains to make and use the saine. A

This invention relates to micrometer calis pers, and has for its object to provide a niieroineter which can be instantly opened or closed to any point wit-hin its capacity without iiiipairing its accuracy or sensitiveness in the slightest degree.

.Another object is to provide a micrometer of this kind which has few parts and which may be made peiiectly accurate at a reasonable cost. I

`With these and other objects in view, my

invention consists of certain novel airangements and combinations of parts of which ment.

'hile I have described iniinite'details I do not liniit myself to these, as the saine may be greatly varied without departing from the spirit and scope ofthe invention.

In the annexed drawing forming a part of this specification and in which like reference characters refer to like parts througliont the several views, Figure 1 is a side elevation of Iny micrometer F ig. 2 is a longitudinal seetional view of t-he saine, the frame being shown in elevation, Fig. 3 is a transverse sectional view taken on the line 3-3 of Fig. 2; Fig. 4 is a bushing; Fig. rack and spindle bushing; and Fig. 6 is a side, elevation view of the spacing plunger.

In the drawing, which is for illustrative thumb press,

side elevation of the sliding 5 1s a perspective view of the purposes only, and, therefore, not drawn to any particular scale, is shown a micrometer embodying my invention. The frame, 1,

anvil, 2, and the sleeve, 3. vWithin the sleeve, I3, is the rack and spindle bushing, 4, which is providedwitli an axially disposed bore, 5, and a rectangular slot forming a rack seat, 6, in its lower ace. This bushing tits PatentedSept. 15, 1908.

1908. Serial No. 409,99.

closely within the inner end ofthe sleeve, 3, and is fastened in place in any convenient manner. On the inner end of the bushing,

sitely disposed longitudinal slots,

tatably and slidaby mount-ed wit-hin the bore, 5, is the smooth cylindrical end, 9, of the spindle, l1t). The opposite end of the spindle, 10, is provided with a screw-threaded portion, 1l, at the extreme of which is collar, 12, upon which is securely fastener the thinible, 13, the thiinble, 13, the collar 12, and the s iindle, 10, being rigidly secured together as shown.

On the inner edge of the thimble, 13, is the annular scale, 14, and on the sleeve 8, is the linear scale, 15, as is usual with mieronieter calipers. Slidably mounted within the sleeve, 3, is the sliding bushing, 16, which is provided with a screw-threaded bore, 17, and a rack, 1S, as shown. The rack, 1S, is adapted to slide within the rack seat, 6, the teeth, 19, thereof projecting'ilownwardly. Within the arm of the frame, 1, near the sleeve, 3, and centrally disposed thereof, is a plunger bore., 20, in which is slidably placed a spacer plunger, or .pawl, 21, which is normally held in its upward position by the spring, 22, and may be forced downwardly by means of the 23, rigidly secured in said spacer plunger and slidable in a vertical slot, 24.

The outer end of the spacer plunger, 21, is provided with a single tooth, 25, having a slaiiting side, 26, and a straight side, 27, as shown, which tooth is adapted to engage between the teeth, 19, of the rack, 18. n order to adjust the pressure of the reduced end, 7, of the bushing 4 on the smooth end, 9, of the spindle,10, I provide a pressure screw, 2S, in the upper part ol" the sleeve, 3, adapted to bear against the u i er member of the redueedend, 7, formed y the slots, S. It is obvious that by turninor this screw, 2S, the upper member of the ret uced end, 7, may be Vcaused to press upon the spindle 10 with any thereof is provided with Vthe usual adjusting l* degree of pressure.` Y

In order that there should be no lost inotion between the spindle, 10, and the sliding bushing, 16, I provide a take-up nut, 29, on the screw-threaded tapered reduced end, 30, of the sliding bushing, 16. d

4, is the reduced end, 7, provided with op1po S. to-

i' unirsi) .sraifrns Aieaargfff @miem A,

fastened in any suitable manner a spacinr...-'

The reduced end, Y

2 Aff t y. i f 1 t 898,972 "fe-n;

30, is divided into resilient members bymeans of slots, 31, whereby rotation of the take-up nut, 29, may cause the end, Si), to more tightly engage the threaded portion. 11.

The graduatioiis ot the linear scale, 15, and

the annular scale, 14, may be of any de sired distance apart, but as is usual in my micrometers,'I refer that the graduatiins of the scale, 15, )e 1/40 of an inch apartand that the annular scale, 14, be divided into twenty-five 4equal parts. As is well known,

, the distance between the threads of the portion, 11, must he exactly the same distance a art as the distance between the graduations et the scale, 15. It will be seen that forty rotations of the thimble, 13, will cause the spindle, 10, to move exactly one inch and that one rotation of the thiinble will cause the spindle to move 1 /40 of an inch, and that the movement of the thimble through one. degree of the annular scale, 14, will cause the spindle to move through 1/25 of 1/40 oi an inch, or 1/1000 of an inch. The teeth, 19, are spaced apart exactly the saine as the graduations of the scale, 15, or the threads of the portion 11, and are so disposed that when the spindle, 10, and the thiiiible, 13, are in position for the zero point of' the scale, 14, to Je exactly on the longitudinal line of the scale, 15, the plunger, 20, Vwill exactly seat between the teeth, 19, and hold the rack,

and the bushing, 16, firmly against longitudinal displacement in the direction away from the anvil, 2.

The o )eration of my micrometer is as ollows: T ie article to be measured is placed between the anvil 2 and the spindle, 10, the plunger 20, is lowered b means of the thumb press, 23, and the spint le, 10, together with the thinible, 13, the sliding bushing, 1G, and the rack, 1S, is moved toward the article to be measured unt-il the end, 9, of the spindle is near the article to be measured. Then the lunger, 20, is allowed to engage between the teeth 19, and the thimble, 13, is rotated and the article calipered and the measure-- ment read just as with an ordinary caliper.

It is thought that the advantages and operation of' my device will be unt ersiood without further explanation. Y

Having thus described my invention, what I claim as new, and desire to secure byLetters- Patent, is:

1. In combination, a frame, a sliding piece adjust-ably secured thereto, said sliding piece being provided with a screw-threaded bore, and a spindle having a screw-threaded portion adapted to be received bv said bore, the range of adjustment of said sliding piece 7oeing substantially equal to the capacity of the micrometer. 1

2. In combination, a U shaped frsne, having a sleevel on the outer extremity of one arm thereof, abushing slid'able in said sleeve, said bushing having a screw-threaded bore, a spindle having a screw-threaded portion adapted to be received by said buslung,

a rack rigidly secured to said bushin \nnd`k means on said frame adapted to engage sai rack. f

of arms, a laterally disposed sleeve on the end of one of said arms, a rackand spindle bushing rigidly secured in said sleeve and having an axially disposed bore, and a seat in the lower side thereof a sliding bushing in' said sleeve and having an axially dis osed 3.l In combination, a frame having a pairv screw-threaded bore and a rack rigid y se- 1 cured thereto and adapted to slide within said seat, a pawl fastened to said frame and adapted to engage the teethof said rack,a spindle having a screwthreaded portion adapted to be received by said screwthreaded bore and a smooth portion adapted to be received by said hrst-mentione bore, and a tl'ii'inble fastened to said spindle,

said thimble being provided with a scale and said sleeve being provided with a line near said scale.

` 4. In. combination a frame having'a bore in one side thereof, a bushing slidablc in said bore, said bushing having a screw threaded bore, a spindle having a screw threaded portion adapted to be received by said screw threaded bore, a rack connected to said bushing and mounted in said frame and means adapted to engage and hold said rack :at anv desired adjustment.

5. In combination, a U shaped frame having an anvil at the extremity of one arm and a laterally disposed sleeve at the extremity of the other arm, a fixed bushing in thel inner end of said sleeve and provided with an a'ially dis nosed smooth bore, a resilient slotted reduced extension, and a rectangular key seat extending longitudinally ofthe lower )ortion thereof, a screw adjustably mounted in the upper part of said sleeve and adapted to rcss against said extension, a sliding bus ring in said sleeve and having an axially disposed screw-threaded bore and a screwtliieaded slotted reduced end, a rack rigidly secured to said sliding bushing and passing through said seat, a spindle having a threaded poitieii adapted to be received by said threaded bore, a nut on said screw-threaded reduced end, a spacing collar on the outer end of said spindle, a tliiinble secured to said s acing collar and receiving said sleeve, said s eeve being provided with a linear scale longitudinally disposed thereof and said thimble being provided with an annular scale thereof ada ted to cooperate with said linear scale, a. p unger adapted to cooperate with the teeth of said rack and seated in a bore extending longitudinally of the` arm of said i 

